A detailed assessment of threats to tarsiers and its habitat: A case of Tarsiers Carlito syrichta (Linnaeus, 1758) in Hindang, Leyte


  • Jay Torrefiel Division of Natural Sciences and Mathematics, University of the Philippines Visayas Tacloban College, Tacloban City 6500, Philippines
  • Brian Sabanal Department of Biological Sciences and Environmental Studies, College of Science and Mathematics, University of the Philippines Mindanao, Mintal, Davao City 8000, Philippines
  • Chester Breech Cuta Department of Biological Sciences, College of Arts and Sciences, Visayas State University, Visca, Baybay City, Leyte 6521-A, Philippines
  • Israel Embayarte Department of Biological Sciences, College of Arts and Sciences, Visayas State University, Visca, Baybay City, Leyte 6521-A, Philippines
  • Ris Menoel Modina Department of Biological Sciences, College of Arts and Sciences, Visayas State University, Visca, Baybay City, Leyte 6521-A, Philippines
  • Crislin Cruz National Coconut Research Center -Visayas, Visayas State University, Visca, Baybay City, Leyte 6521-A, Philippines
  • Fretzeljane Pogado Department of Biological Sciences, College of Arts and Sciences, Visayas State University, Visca, Baybay City, Leyte 6521-A, Philippines
  • Kim Dianne Ligue Department of Mathematics, Physics, and Computer Science, College of Science and Mathematics, University of the Philippines Mindanao, Mintal, Davao City 8000, Philippines
  • Lief Erikson Gamalo University of the Philippines Mindanao




Fragmentation, Karst forest, Leyte Island, Tarsier, Threat


The Philippine tarsier Carlito syrichta (Linnaeus, 1758) is considered a specially protected flagship species in the Philippines. However, the species is threatened due to natural disasters and human activities. Little is known about the ecology and existing threats of tarsier populations in some islands in the Philippines, particularly in Samar, Dinagat, Biliran, and Leyte. In this study, we report the existence of a population of tarsiers utilizing a karst forest patch in Hindang, Leyte, and characterize the habitat of the species after a super typhoon. Using field-based observations, camera traps, and Focus Group Discussions (FGDs) with the stakeholders, we generated baseline data on tarsiers in Mt. Bontoc, their habitats, and the existing and possible future threats. Results revealed that tarsiers were present in forested areas dominated by small-sized trees having a mean diameter at breast height (DBH) of 2.5 centimeters and a mean height of 5.0 meters. These trees are harvested for firewood. Recorded threats to the population and its habitat include incidental captures of the animal, typhoons, forest fires, and the presence of exotic animals. FGDs revealed high concerns of the stakeholders for the protection and conservation of the species and the inclusion of the tarsiers for local management and tourism strategies in the future. The study highlights the significance of field visits and community participation to assess the local threats to tarsiers for future actions in terms of biodiversity conservation in fragmented habitats. 


Adamík, P., Poledník, L., Poledníková, K., & Romportl, D. (2019). Mapping an elusive arboreal rodent: Combining nocturnal acoustic surveys and citizen science data extends the known distribution of the edible dormouse (Glis glis) in the Czech Republic. Mammalian Biology, 99(1), 12-18. https://doi.org/10.1016/j.mambio.2019.09.011

Arrijani, & Rizki, M. (2020). Vegetation analysis and population of tarsier (Tarsius spectrumgurskyae) at Batuputih Nature Tourism Park, North Sulawesi, Indonesia. Biodiversitas Journal of Biological Diversity, 21(2), 530-537. https://doi.org/10.13057/biodiv/d210214

Aure, B., & Escabi-Ruiz, C. M. (2005). Tarsier talk: Tarsiers, hunters, and ecotourism in Corella, Bohol. Philippine quarterly of culture and society, 33(1/2), 76-99. doi:10.2307/29792569

Bejar, S. G. F., Duya, M. R. M., Duya, M. V., Galindon, J. M. M., Pasion, B. O., & Ong, P. S. (2020). Living in small spaces: Forest fragment characterization and its use by Philippine tarsiers (Tarsius syrichta Linnaeus, 1758) in Mindanao Island, Philippines. Primates, 61(3), 529-542. DOI: 10.1007/s10329-020-00798-2

Boonratana, R. (2020). Asian primates in fragments: Understanding causes and consequences of fragmentation, and predicting primate population viability. American Journal of Primatology, 82(4). https://doi.org/10.1002/ajp.23082

Brown, R. M., Weghorst, J. A., Olson, K. V., Duya, M. R., Barley, A. J., Duya, M. V., Shekelle, M., Neri-Arboleda, I., Esselstyn, J. A., Dominy, N. J., & Ong, P. S. (2014). Conservation genetics of the Philippine tarsier: Cryptic genetic variation restructures conservation priorities for an island archipelago primate. PLoS One, 9(8). https://doi.org/10.1371/journal.pone.0104340

Causon, A. A. (2020). Putol na bahagi ng katawan ng tarsier natagpuan sa Davao City. https://news.abs-cbn.com/news/01/15/20/putol-na-bahagi-ng-katawan-ng-tarsier-natagpuan-sa-davao-city

Cayubit, R. (2017). Tarsiers thrive in Southern Leyte barangay sanctuary. https://www.pressreader.com/philippines/manilabulletin/20170317/281805693741628

Dagosto M., Gebo D. L. (1997) A preliminary study of the Philippine tarsier in Leyte. Asian Primates, 6, 4–8.

Dagosto, M., Gebo, D. L., & Dolino, C. (2001). Positional behavior and social organization of the Philippine tarsier (Tarsius syrichta). Primates, 42(3), 233-243. https://doi.org/10.1007/BF02629639

De la Cruz, J. O., & Casas Jr, E. V. (2015). Captive observations and comparative morphology of Philippine tarsier (Carlito syrichta) in Brgy. Hugpa, Biliran, Biliran: a preliminary study. Philippine Journal of Natural Sciences, 20(1), 46-54.

Department of Environment and Natural Resources (DENR) (2019). DENR Administrative Order No. 2019–09: Updated National List of Threatened Philippine Fauna and Their Categories. https://bmb.gov.ph/downloads/WRD/WC/WC2020/stat_and_lists_of_ wildlife/faun/dao- 2019-09.pdf

De Waele, J., Gutiérrez, F., Parise, M., & Plan, L. (2011). Geomorphology and natural hazards in karst areas: A Review. Geomorphology, 134(1-2), 1–8. https://doi.org/10.1016/j.geomorph.2011.08.001

Flannigan, M. D., Amiro, B. D., Logan, K. A., Stocks, B. J., & Wotton, B. M. (2006). Forest fires and climate change in the 21st Century. Mitigation and Adaptation Strategies for Global Change, 11(4), 847–859. https://doi.org/10.1007/s11027-005-9020-7

Gabieta, J. (2022). PH tarsier spotted in Tacloban for 1st time. https://newsinfo.inquirer.net/1645483/ph-tarsier-spotted-in-tacloban-for-1st-time

Gamalo, L. E., Sabanal, B., & Ang, A. (2021). Three decades of Philippine nonhuman primate studies: research gaps and opportunities for Philippine primatology. Primates, 62(1), 233-239. https://doi.org/10.1007/s10329-020-00847-w

Gursky, S. (1998). Effects of radio transmitter weight on a small nocturnal primate. American Journal of Primatology, 46(2), 145-155. https://doi.org/10.1002/(SICI)1098-2345(1998)46:2<145::AID-AJP4>3.0.CO;2-W

Gursky, S. (2002). Predation on a wild spectral tarsier (Tarsius spectrum) by a snake. Folia Primatologica, 73(1), 60. https://doi.org/10.1159/000060422

Gursky, S., Salibay, C. C., & Cuevas, C. Z. (2011). Population survey of the Philippine tarsier (Tarsius syrichta) in Corella, Bohol. Folia primatologica, 82(3), 189-196.

Gursky, S., Salibay, C., Grow, N., & Fields, L. (2017). Impact of typhoon Haiyan on a Philippine tarsier population. Folia Primatologica, 88(4), 323-332. https://doi.org/10.1159/000332594

Holden, W. N., & Marshall, S. J. (2018). Climate change and typhoons in the Philippines: Extreme weather events in the anthropocene. Integrating Disaster Science and Management, 407–421. https://doi.org/10.1016/b978-0-12-812056-9.00024-5

IUCN & CMP. (2012). IUCN‐CMP Unified Classification of Direct Threats Version 3.2. Gland, Switzerland. https://nc.iucnredlist.org/redlist/content/attachmentfiles/ dec2012guidancethreats_ classification_scheme.pdf

Matthews, T. J., Cottee‐Jones, H. E., & Whittaker, R. J. (2014). Habitat fragmentation and the species–area relationship: A focus on total species richness obscures the impact of habitat loss on habitat specialists. Diversity and Distributions, 20(10), 1136–1146. https://doi.org/10.1111/ddi.12227

Mayuga, J. L. (2016). BPI-inspected’ boxes yield tarsiers, endemic wildlife. Business Mirror. https://businessmirror.com.ph/2016/01/31/bpi-inspected-boxes-yield-tarsiers-endemicwildlife/

Merker, S., & Muhlenberg, M. (2000). Traditional land use and Tarsiers-human influences on population densities of Tarsius dianae. Folia Primatologica, 71(6), 426. https://doi.org/10.1159/000052742

Merker, S., Yustian, I., & Mühlenberg, M. (2005). Responding to forest degradation: Altered habitat use by Dian’s tarsier Tarsius dianae in Sulawesi, Indonesia. Oryx 39: 189–195. https://doi.org/10.1017/S0030605305000438

Mohd Rameli, N. I., Lappan, S., Bartlett, T. Q., Ahmad, S. K., & Ruppert, N. (2020). Are social media reports useful for assessing small ape occurrence? A pilot study from Peninsular Malaysia. American journal of primatology, 82(3), e23112. https://doi.org/10.1002/ajp.23112

Munds, R. A., Ali, R., Nijman, V., Nekaris, K. A. I., & Goossens, B. (2013). Living together in the night: abundance and habitat use of sympatric and allopatric populations of slow lorises and tarsiers. Endangered Species Research, 22(3), 269-277. http://dx.doi.org/10.3354/esr00556

Neri-Arboleda, I., Stott, P., & Arboleda, N. P. (2002). Home ranges, spatial movements and habitat associations of the Philippine tarsier (Tarsius syrichta) in Corella, Bohol. Journal of Zoology, 257(3), 387-402. http://dx.doi.org/10.1017/S0952836902000997

Obeña, R. D. R., Tolentino, P. J. S., Villanueva, E. L. C., Fernandez, D. A. P., Angeles, M. D. D., & Buot, Jr. I. E. (2021). Flora and fauna inventory of Limestone Forests in Taft, Eastern Samar, Philippines. The Thailand Natural History Museum Journal, 15(1), 1-20. http:doi.org/10.14456/thnhmj.2021.1

Proclamation No. 1030 (1997). Declaring the Philippine Tarsier (Tarsius syrichta) as a Specially Protected Faunal Species of the Philippines. https://www.officialgazette.gov.ph/1997/06/23/proclamation-no-1030-s-1997/

Řeháková-Petrů, M., Peške, L., & Daněk, T. (2012). Predation on a wild Philippine tarsier (Tarsius syrichta). Acta ethologica, 15(2), 217-220. https://doi.org/10.1007/s10211-011-0096-7

Rickart, E. A., Heaney, L. R., Heideman, P. D., & Utzurrum, R. C. B. (1993). The distribution and ecology of mammals on Leyte, Biliran, and Maripipi Islands, Philippines. Fieldiana Zoology, 72, 1-62.

Severo, J. M. (2021). What happened to tarsiers in Bohol after Typhoon Odette? https://www.philstar.com/lifestyle/travel-and-tourism/2021/12/23/2149723/what-happenedtarsiers-bohol-after-typhoon-odette

Shekelle, M. (2020). Carlito syrichta (Linnaeus, 1758). The IUCN Red List of Threatened Species 2020. https://doi.org/10.2305/IUCN.UK.2020-3.RLTS.T21492A17978520.en

Wojciechowski, F. J., Kaszycka, K. A., & Otadoy, J. B. (2021). Utilizing local community knowledge of the Philippine tarsier in assessing the Bilar population endangerment risk, and implications for conservation. Journal for Nature Conservation, 62, 126028. https://doi.org/10.1016/j.jnc.2021.126028




How to Cite

Torrefiel, J. ., Sabanal, B., Cuta, C. B., Embayarte, I., Modina, R. M. ., Cruz, C. ., Pogado, . F. ., Ligue, K. D., & Gamalo, L. E. (2022). A detailed assessment of threats to tarsiers and its habitat: A case of Tarsiers Carlito syrichta (Linnaeus, 1758) in Hindang, Leyte. Journal of Wildlife and Biodiversity, 7(3), 80–95. https://doi.org/10.5281/zenodo.7308755